Cassius m



(No Model.)

0. M. RICHMOND.

ARTIFIGIAL DENTURE.

Patented July 31 v a i V InVeH/Zor minems'e;

UNITED, STATES PATENT OFFICE.

OASSIUS M. RICHMOND, OF NEVVYORK, N. Y., ASSIGNOR TO THE RICHMOND TOOTH GROWN COMPANY.

ARTIFICIAL DENTUR E.

SPECIFICATION forming part of Letters Patent No. 282,119, dated July 31, 1883.

Application filed A ril 6, 1883. (No model.)

To all whom it may concern: v

Be it known that I, CASSIUS M. RICHMOND, a citizen of the United States, and a resident of the city, county, and State of New York, have invented certain new and useful Improvements in Artificial Dentures, of which the following is a specification.

My invention relates to an improved process of preparing and securing artificial dentures, whereby single crowns may be readily secured to the natural roots.

In my drawings similar letters refer to similar parts.

Figure 1 represents a View of the root with the tooth-crown applied; Fig. 2, a sectional view of the same; Fig. 3, a section of the prepared root; Fig. 4:, a View of the crown as prepared when no pin is used. Fig. 5 is a view of a modified form of ferrule.

A represents the root. In practice the nerve is removed, and it is also preferable to drill a hole, J, in the root, as shown. The end of the tooth being then properly prepared, a ferrule, B, is made of such a size as to exactly fit the base of the root. This ferrule is then secured to a tooth-crown in any suitable mannerfor instance, by soldering it to the plate D at the back of the tooth-crown, or otherwise. A suitable pin, Z, may also be secured to project through the ferrule centrally from the end of the tooth. This pin is designed to enter the hole J drilled in the root. The ferrule of the prepared crown is then slipped upon the prepared root, as shown in Fig. 2,

and cemented thereto. The cement surround 3 5 ing the pin Z is shown at K. In Fig. 5 the separate ferrule is shown as being in the form of a cap,-to be secured to the tooth-crown as before.

In separate applications for Letters Patent 40 I have described modes of connecting crowns to roots by securing such crowns to caps cov ering the ends of the roots. The mode herein set forth avoids the necessity of applying the cap to the root, the ferrule up on the tooth crown 4 5 sometimes be dispensed with, in which case 50 the crown is provided only with a ferrule, as

shown in Fig. 4.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination, with the root of a natural 5 tooth, and with an artificial crown adapted thereto, of an unfianged band inclosing the adjacent ends of both root and tooth, substantially as described.

GEO. H. EVANS, WM. A. PoLLocK. 

